Subject: [IGSREPORT-9160] Wk 1158 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Date: Thu, 04 Apr 2002 17:12:47 EST

******************************************************************************
IGS Electronic Report   04 Apr 14:12:49 PST 2002      Message Number 9160
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1158 -  02/03/17 to 02/03/23
===================================================================

1) Contacts:
============
e-mail: [email-masked]
Tel:    (613)995-4002 (Remi Ferland)
Fax:    (613)995-3215

2) Products:
============
All products are available at cddisa.gsfc.nasa.gov

igs02P1158.snx  Combined weekly solution. 
igs02P1158.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS02P12.snx    Cumulative Combined solution. 
igs02P1158.sum  This file.
igs02P1158.itr  Residuals between the AC and the IGS00 for the RF stations. 
igs02P1158.res  Residuals between the AC and the Combined Weekly solution.
IGS02P12.res    Residuals between the AC and the Cumulative Combined solution.
 
Where IGSyyPww & igsyyPwwww represent:
      yy      Last 2 digits of the year
      ww      week in year yy
      wwww    GPS week
      P       GPS technique used

3) Combination Strategy:
========================

       The AC solutions are processed using the following procedure:

3-1) The AC solutions are checked/corrected for possible format problems,
     station names inconsistencies, etc...
3-2) The AC solutions are unconstrained according to the information provided
     in the SOLUTION/APRIORI Block.
3-3) The AC solutions are aligned (using a 7-parameters) and compared to the
     IGS00 stations at the current epoch.
     ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS01P37_RS54.SNX.Z
3-4) The AC are compared to IGS00, to each other, to the previous week
     solution and to the cumulative solution in order to identify and remove
     outliers.
3-5) The weekly AC solutions are combined and added to the cumulative
     combined solution. The cumulative combination is done to ensures 14
     parameters singularity.

     The weekly combined solution is aligned to the IGS00 of the current
     epoch using a 7-parameters transformation. The singular cumulative
     combined solution is aligned to the IGS00 of the reference epoch
     using a 14-parameters transformation and the 54 ITRF station positions
     and velocities. The IGS00 is a realization of ITRF2000.

     For more details, see:
     Blewitt, G., C. Boucher and J. Kouba, 1997, Procedure for ITRF continuous
       realization, the report of the IGS GB, presented to the IGS Governing 
       Board Meeting held in San Francisco, Dec. 11.
     Kouba, J., J. Ray and M.M. Watkins, IGS Reference Frame Realization, 1998
       IGS Analysis Center Workshop Proceedings, European Space Operations
       Centre, Darmstadt, Germany.

The combination software was developed at NRCan.

4) Remarks:
===========

     ITR = IGS01P37_RS54.SNX
     igs = igs02P1158.snx
     IGS = IGS02P12.snx

     BuA = IERS Bulletin A

     mit ncl are used to quality control the weekly combination.
     gfz excluded from the geocenter estimation (Sec. 5-4).

     Solutions with manual station deletion:
         After unconstraining:
             jpl  KELY
             emr  NRC1  NRC2

     4-1) Starting with GPS week 1143, the solutions are aligned to the
     IGS01P37_RS54.SNX realization of ITRF2000.

     4-2) Starting with GPS week 1078, UT1-UTC from IERS Bulletin A
     is included in the erp files.

5) Results:
===========

5-1)      AC (Variance Factor)^0.5 estimates:
==================================================
           The residuals used in the estimation of the Variance Factor
           are the differences between the cumulative combined solution
           and each AC weekly solution.
           SF = (Variance Factor)^0.5 = (Chi^2/dof)^0.5
           Final(SF) = Apriori(SF) * Aposteriori(SF)

Solution       |# sta| #RF |    Apriori(SF)|Aposteriori(SF)|      Final(SF)|
---------------|-----|-----|---------------|---------------|---------------|
cod            | 133 |  48 |        24.117 |         0.997 |        24.047 |
emr            |  56 |  34 |         3.755 |         1.000 |         3.755 |
esa            |  64 |  38 |        10.469 |         0.999 |        10.458 |
gfz            |  83 |  38 |        11.366 |         0.998 |        11.342 |
jpl            |  73 |  30 |         4.315 |         1.000 |         4.313 |
ngs            |  76 |  50 |        19.800 |         0.999 |        19.773 |
sio            | 131 |  48 |         2.370 |         0.982 |         2.327 |
mit            | 161 |  50 |         4.103 |         0.910 |         3.732 |
ncl            | 108 |  49 |         2.632 |         1.013 |         2.667 |
igs            | 166 |  52 |         1.332 |         1.053 |         1.402 |
---------------|-----|-----|---------------|---------------|---------------|

5-2)      Solution Residuals weighted Average & STD :
=====================================================

5-2-1)    With respect to the IGS00 stations:
=============================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod         47 |    -0.6      0.2     -1.1 |     2.8      3.2      8.6 |
emr         32 |    -0.1      0.5      1.7 |     3.7      5.3     12.4 |
esa         36 |    -6.7      0.3     -0.1 |     8.5      5.6     12.1 |
gfz         37 |    -1.5      0.5     -0.6 |     3.5      4.4      7.8 |
jpl         29 |    -1.7      0.5      0.1 |     3.0      2.9     12.0 |
ngs         49 |    -2.5      1.1     -0.4 |     4.0      4.8      8.2 |
sio         46 |    -1.5      0.7      0.0 |     2.8      3.6     10.4 |
mit         49 |    -1.1      0.3     -0.9 |     2.8      3.1      7.4 |
ncl         48 |    -0.4      0.4     -0.3 |     2.7      3.1      6.4 |
---------------|---------------------------|---------------------------|

5-2-2)    With respect to the Weekly Combination:
=================================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        131 |     0.8     -0.1     -0.4 |     1.3      1.2      4.7 |
emr         54 |     1.1     -0.1     -0.3 |     3.3      5.1     10.1 |
esa         63 |    -5.3     -0.4      1.1 |     6.5      4.6      9.8 |
gfz         81 |    -0.3      0.5      0.1 |     2.2      2.7      5.2 |
jpl         72 |    -0.4     -0.1     -1.3 |     2.3      1.6      8.5 |
ngs         74 |    -0.7      0.6      0.2 |     3.6      4.7      6.0 |
sio        127 |     0.5      0.1      2.3 |     2.5      2.4      8.5 |
mit        151 |    -0.1     -0.1     -0.7 |     0.9      0.7      3.3 |
ncl        106 |     0.9      0.0      0.7 |     1.3      0.7      3.5 |
ITR         51 |     1.3     -0.7     -0.2 |     2.8      2.6      7.2 |
---------------|---------------------------|---------------------------|

5-2-3)    With respect to the Cumulative Combination:
=====================================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        126 |    -1.0      0.2     -1.1 |     2.7      2.7      7.3 |
emr         53 |    -0.4      0.0     -0.9 |     3.9      6.2     12.3 |
esa         62 |    -7.2     -0.1     -0.5 |     8.0      5.3     12.1 |
gfz         74 |    -1.6      0.6     -0.7 |     3.6      3.8      7.3 |
jpl         65 |    -1.7     -0.1     -2.1 |     2.9      2.8     10.3 |
ngs         74 |    -2.2      0.7     -0.3 |     4.0      5.2      8.2 |
sio        125 |    -1.2      0.6      1.6 |     3.5      3.9     11.3 |
mit        137 |    -1.7      0.3     -1.2 |     2.9      2.6      6.5 |
ncl        105 |    -0.6      0.3      0.3 |     2.6      2.7      6.3 |
igs        148 |    -1.6      0.4     -0.7 |     2.5      2.6      6.6 |
ITR         54 |    -0.1     -0.1      0.0 |     0.6      0.6      1.4 |
---------------|---------------------------|---------------------------|

5-3)      7-Parameters Transformation: AC ----> IGS01P37_RS54.snx
=================================================================

5-3-1)    Estimates : 
=====================

Solution       |    R X      R Y      R Z      T X      T Y      T Z      SCL  |
               |   (mas)    (mas)    (mas)     (mm)     (mm)     (mm)    (ppb) |
---------------|---------------------------------------------------------------|
cod            |   0.002    0.005   -0.029     11.4      1.2     -6.7     1.54 |
emr            |   0.074    0.058    0.002     -8.7    -19.9    -33.2     0.52 |
esa            |   0.099   -0.006   -0.037    -23.8      6.3      5.0     1.35 |
gfz            |   0.073   -0.149   -0.045     -0.8      1.0     -3.4     0.87 |
jpl            |  -0.015   -0.001   -0.067      0.5     -0.5     -5.3     0.96 |
ngs            |  -0.236    0.196   -0.105     -8.6    -15.8     32.8     1.48 |
sio            |  -0.151    0.108   -0.009      5.6     -4.3     42.4     1.18 |
mit            |  -0.010   -0.017   -0.012      0.1      0.1      0.9     1.32 |
ncl            |  -0.031   -0.017   -0.060      0.2     -0.6     -1.7     0.97 |
---------------|---------------------------------------------------------------|

5-3-2)    STD : 
===============

Solution       |    R X      R Y      R Z      T X      T Y      T Z      SCL  |
               |   (mas)    (mas)    (mas)     (mm)     (mm)     (mm)    (ppb) |
---------------|---------------------------------------------------------------|
cod            |   0.057    0.058    0.064      1.5      1.5      1.5     0.23 |
emr            |   0.069    0.069    0.079      1.8      1.8      1.8     0.28 |
esa            |   0.068    0.069    0.075      1.8      1.8      1.8     0.27 |
gfz            |   0.066    0.067    0.072      1.7      1.7      1.7     0.27 |
jpl            |   0.076    0.070    0.082      1.9      1.9      1.9     0.29 |
ngs            |   0.057    0.058    0.063      1.5      1.5      1.5     0.23 |
sio            |   0.059    0.059    0.065      1.5      1.5      1.5     0.24 |
mit            |   0.056    0.057    0.064      1.5      1.5      1.5     0.23 |
ncl            |   0.057    0.057    0.064      1.5      1.5      1.5     0.23 |
---------------|---------------------------------------------------------------|

5-4)      Geocenter:
====================

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |    -1.4     -4.4      2.2 |     2.3      2.4      5.6 |
---------------|---------------------------|---------------------------|

5-5)      ERP Residuals Weighted Average & STD :
================================================

5-5-1)    Weighted Average :
============================

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---       -1.0      -1.1       ---        .5       --- |
emr            |     ---        6.0      -8.3     -11.5       1.8     -14.9 |
esa            |     ---        2.0     -12.2        .8      -9.4       3.9 |
gfz            |     ---       15.0       2.6       1.3       6.1       1.4 |
jpl            |     ---        2.1       -.8      -9.9       2.0      -8.4 |
ngs            |     ---        6.4      25.3     -46.5      18.1     -26.8 |
sio            |     ---      -18.1       5.9      -1.5       4.2      -4.3 |
mit            |     ---        2.7      -1.7        .6      -2.1        .6 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       14.7      -2.1        .9      20.1       -.3 |
---------------|------------------------------------------------------------|

5-5-2)    STD :
===============

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        4.3       1.8       ---       3.7       --- |
emr            |     ---        9.2       6.8      43.0       9.7      43.8 |
esa            |     ---        9.1       4.1      10.7       6.4      13.8 |
gfz            |     ---        7.1       3.2       4.8       2.0       5.5 |
jpl            |     ---       18.8       4.3      21.4       2.9      13.7 |
ngs            |     ---       78.4       9.0      61.3      15.9      36.0 |
sio            |     ---        8.1       3.0       3.8       3.2       8.4 |
mit            |     ---        5.0       1.0       2.2       1.9       3.5 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       20.4       2.0       7.4       5.0      11.6 |
---------------|------------------------------------------------------------|

5-6)      Outliers:
===================

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
IGS01P37_RS54.snx    emr11587.snx        |YAR1  A ----|    1.5   -27.9    76.7|
                                         |            |                       |
IGS01P37_RS54.snx    esa11587.snx        |CHAT  A ----|    8.0   -16.7   -90.6|
                                         |            |                       |
IGS01P37_RS54.snx    ngs11587.snx        |MCM4  A ----|   -2.9     3.8    83.6|
                                         |            |                       |
cod11587.snx         esa11587.snx        |PIMO  A ----|  -10.0   -10.9   -89.5|
                                         |            |                       |
emr11587.snx         esa11587.snx        |SANT  A ----|    4.4    20.5    51.0|
                                         |            |                       |
emr11587.snx         sio11587.snx        |SANT  A ----|   -1.9     5.4    53.9|
                                         |            |                       |
esa11587.snx         gfz11587.snx        |PIMO  A ----|    9.0    10.1   104.1|
                                         |            |                       |
esa11587.snx         jpl11587.snx        |PIMO  A ----|   12.3     7.7    90.0|
                                         |            |                       |
esa11587.snx         sio11587.snx        |PIMO  A ----|    9.5     6.3   121.0|
                                         |            |                       |
esa11587.snx         mit1158g.snx        |PIMO  A ----|   10.3    10.0    89.3|
                                         |            |                       |
esa11587.snx         ncl1158g.snx        |PIMO  A ----|   11.0     9.2    98.7|
                                         |            |                       |
ngs11587.snx         sio11587.snx        |BAKO  A ----|    2.2    -2.1    61.1|
                                         |            |                       |
ngs11587.snx         mit1158g.snx        |BAKO  A ----|    1.2    -4.3    75.4|
                                         |            |                       |
igs02P1157.snx       esa11587.snx        |KIRU  A ----|  -13.5   -11.1    52.5|
                                         |            |                       |
igs02P1157.snx       sio11587.snx        |KIRU  A ----|   -5.1   -12.9    51.7|
                                         |            |                       |
IGS02P11.snx         cod11587.snx        |WUHN  A ----|    5.0     5.6   -73.0|
                                         |            |                       |
IGS02P11.snx         cod11587.snx        |HOFN  A ----|    4.6    -2.5   -43.3|
                                         |            |                       |
IGS02P11.snx         gfz11587.snx        |WUHN  A ----|    3.9     8.4   -80.8|
                                         |            |                       |
IGS02P11.snx         gfz11587.snx        |HOFN  A ----|    4.9     0.9   -43.5|
IGS02P11.snx         gfz11587.snx        |SSIA  A ----|  -25.8    10.8    -6.1|
                                         |            |                       |
IGS02P11.snx         jpl11587.snx        |WUHN  A ----|    8.0     5.3   -93.9|
IGS02P11.snx         jpl11587.snx        |YEBE  A ----|   12.2   -23.9   132.0|
                                         |            |                       |
IGS02P11.snx         ngs11587.snx        |WUHN  A ----|   10.2     6.2   -93.8|
                                         |            |                       |
IGS02P11.snx         sio11587.snx        |WUHN  A ----|    7.4     4.9   -68.9|
                                         |            |                       |
IGS02P11.snx         mit1158g.snx        |WUHN  A ----|    5.4     5.5   -79.1|
IGS02P11.snx         mit1158g.snx        |YEBE  A ----|   12.4   -24.6   127.1|
                                         |            |                       |
IGS02P11.snx         mit1158g.snx        |HOFN  A ----|    4.2    -2.2   -42.6|
                                         |            |                       |
IGS02P11.snx         ncl1158g.snx        |WUHN  A ----|    6.3     6.2   -81.8|
                                         |            |                       |
IGS02P11.snx         ncl1158g.snx        |HOFN  A ----|    4.3    -0.9   -41.0|
                                         |            |                       |
IGS02P11.snx         igs02P1158.snx      |AREQ  A    2|   -9.8    -8.7     2.8|
-----------------------------------------|------------|-----------------------|

5-7)      Conflicts:
====================

IERS DOMES NO    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
    30314M002 SUTH A SUTH A SUTH B SUTH A SUTH A SUTH A SUTH A SUTH A SUTH A
    22306M002 IISC A IISC A        IISC A IISC A IISC B IISC A IISC A IISC A
    42005M001 GALA A GALA A GALA B GALA A GALA A GALA B GALA A GALA A GALA A
    13407S012 MADR A               MADR A        MADR A MAD2 A MADR A MADR A
    14234M001 PTBB A                                                  PTBB A
              PTBB A
    40114M001 NRC1 A NRC1 A NRC1 A                      NRC1 A NRC1 A NRC1 A
                     NRC2 A 
    40405S031 GOLD A               GOLD A        GOL2 A GOL2 A GOLD A GOLD A
    42202M005 AREQ A AREQ A        AREQ A AREQ A AREQ B AREQ A AREQ A 
    50103M108 TIDB A        TIDB A TIDB A TIDB A TID2 A        TIDB A TIDB A
                            TID2 A
    22003M001 PIMO A        PIMO B PIMO A PIMO A        PIMO A PIMO A 
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  CAVA A  SFEL A  VOLT A
 
IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    31303M001 MAS1 A 
    31303M002        MAS1 A MAS1 A MAS1 A
    40114M001 NRC2 A NRC1 A NRC1 A NRC1 A
    40405S031 GOLD A        GOLD A GOLD A
              GOL2 A 
    50103M108 TIDB A TIDB A TIDB A TIDB A
              TID2 A 
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  BISH A  PTBB A
 
--